I don’t understand what you mean by tribal impulse, nature’s way, and human defense? This is just white identity, which is white racism. That’s it. I recently wrote an article about these lines because they are common, they are wrong, and they make excuses for white racism. Tribalism implies strong group loyal, to defend the group, to stick with the group. These aren’t natural groups. It’s white racism. White racism is about the problem whites have with each other, white racism creates problems because whites don’t get along. The motivation is not group loyalty, it’s to ease the infighting, it’s because white people are cruel to each other. Does that sound like tribalism? Even if you say yes, it’s engineered and not nature or human defense. Humans existed for a long time without white racism. So, again, you are making excuses for white racism and it’s not acceptable.